How big can goldfish grow if they are free in the wild?

In general, the size of a goldfish depends on the specific variety and the environment in which it lives. When kept in captivity, goldfish typically reach a maximum length of about 10-12 inches. However, in the wild, goldfish have been known to grow much larger. For example, in some large lakes or ponds, wild goldfish have been reported to reach lengths of up to 2 feet or more. These unusually large goldfish are often referred to as "monster goldfish" or "tank busters." The growth rate and ultimate size of wild goldfish are influenced by various factors, including the availability of food, space, and genetics.